component/tip — pull request #22 by stephenmathieson (2013-10-24 23:38:39+00:00)
Title: aria-describedby

adding [aria-describedby](https://developer.mozilla.org/en-US/docs/Accessibility/ARIA/ARIA_Techniques/Using_the_aria-describedby_attribute) to the element the tip is associated with for screen readers